mbox_msg->len is of type size_t and %d is incorrect format. Instead
use %zu for handling size_t correctly.
Reviewed-by: NLokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: NNishanth Menon <nm@ti.com>
Signed-off-by: NSantosh Shilimkar <santosh.shilimkar@oracle.com>